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'GEORGE WASHBU'RN, OF NEW YORK, N. Y.-

Letters Paten-t No. 79,879, dated July 14, 1868; antedated June 27, 1868.

IMPROVED LOCK-BOLT:

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To ALL WHoM 1T MAY' coNonRN:

Beit known that I, GEORGE'WASHBURN, of the city, county, and State of New York, have'invcnted anew and improved Lock-Bolt;- and that the following desciiptiomtaken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification ofthe same, wherein I have set forth the nature and principles of my said-improvement, by which my invention may be distinguished vfrom al1 others of a similar class, together with such parts as I claim, and desire ,to have secured tome by Letters Patent. ff* i' .This invention consists in applying a. locking-mechanism to a slide-bolt in snchia manner that the bolt may be operated by a key from the outer side ofthe door.

`The invention is designed to supersede the ordinary key-latches and similar fastening now applied to doors and which are very unreliable'on account of their liability to get out of repair, and the facility with which they Amay be picked and illegitimately opened.

In the accompanying sheet of drawings- Figure 1A is a view of my invention applied to a door.

Figure 2, a transverse section of the same, taken in the line z a'.

Similar letters of reference indicate likeparts.

A represents a door, and B the casing or frame thereof. AC is a slide-bolt, which is tted and. allowed to slide freely in guides` a, attached to a plate, I1, the latter being secured to the inner side of the door by screws c.

To one of the side pieces or jambs d ofthe frame or case B of the door, a nosing, D, is secured, to receive' the end of the bolt when the door is to be fastened or bolted.

In .the'upper edge of the bolt CA there is a series of teeth which form a rack, E, into which a pinion, F, gears, the latter being enclosed by a cap, G, secured to the plate by screws or otherwise.l l

` This pinion F is provided with a shaft or axis, H, which passes through ahole in the plate b, and on the outer end of said shaft oraxis there is placed a loose cylinder or ferrule, e, which is allowed to turn freely, lso as to prevent the shaft or axis H, and consequently the pinion F, from being turned by the application of pliers or forceps from thc outer side of the door. Y

In the shaft or axis I-I, between thepinion and thimble, there is made a hole, f, to re'ceive a pin, (rj, on the inner end of a thumb-lever, I, attached to the key J, the latter being simply a tube, 7L, provided with a bow, i, at its outer end, as shown clearly in. fig. 2. The ping of the key passes through a hole in the tube z, and into holof of the shaft or axis7 when the key is inserted in the key-holeof the door, the tube 7L of the key 'receiving the shaft or axis. l

It will be sccn that the pin g causes a connection to be formed between the key andthe shaft or axis H, :which admits of the pinion F being turned by the key, the pinion moving or sliding the bolt. The arrangement` is extremely simple and efficient; there areno springs to getout-of order, and the bolt cannot beillegitimately operated uponvfrom the outer side of the door. i i

I-Iaving thus described my invention, I claim as new, and desire to'secure by Letters Patent- 1. The combination and arrangement of the slide-bolt C, provided with the rack E,`the case G, pinion F, and shaft H, provided with the boltf and collar c, all operating as described, for the purpose specified.

2. "lhe key'J, providedwith the thumb-lever I, having the pin g attached, in combination with the shaft or arbor IIofthe pinion Fi, said shaft having the holef, substantially as and for the purpose specified.

e. WAsHnUnN.

Witnesses:

WM. F. MeNAMAnA, ALEX. F. Renners. 

